I have just retired after 44 years of flying 43 of which were with airlines, i started in 1966, i`m now 65, --the last 5 years flying A320`s my opinion is that 65 is quite old enough, there is no way a 65 year old is going to climb into a raft, (mind you at my final drill 1 year ago hardly anybody except the youngest and fittest F/O`s could do it either). At 65 most people are just physically not up to all the different drills etc, however most can easily pass the sim. of course there will be excecptions but they will be few.